<!DOCTYPE html>
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<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
         
         $a = $_GET['x'];
         $b = $_GET['y'];
         echo "x=$a,y=$b<br>";
         echo "tong la:".($a+$b)."<br>";
         echo "hieu la". ($a-$b)."<br>";
         echo "thuong la".($a/$b)."<br>";
         echo "tich la". ($a*$b)."<br>";
        ?>
    </body>
</html>
